#include <stdio.h>
#include <pthread.h>
void * thread_summation(void *arg);

int sum = 0;

int main(int argc, char *argv[]){
	pthread_t id_t1,id_t2;
	int range1[] = {1,5};
	int range2[] = {6,10};

	pthread_create(&id_t1,NULL,thread_summation,(void *)range1);
	pthread_create(&id_t2,NULL,thread_summation,(void *)range2);

	pthread_join(id_t1,NULL);
	pthread_join(id_t2,NULL);
	
	printf("sum = %d\n",sum);
	return 0;
}

void * thread_summation(void *arg){
	int start = ((int *)arg)[0];
	int end = ((int *)arg)[1];

	while(start <= end){
		sum += start;
		start++;
	}

	return NULL;
}